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A rifle is aimed horizontally at a target 30 m away. The bullet hits the target 2.10 cm below the aiming point. What is the bullet's time of flight?
A 25.5-mW laser beam of diameter 2.08 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
What percentage of the neutrons would not interact if the concrete slab were made 45.0 cm thick? How many centimeters thick would the concrete need to be so that 12.0 per cent of the neutrons are transmitted.
q1. an important news announcement is trans- mitted by radio waves to people who are 122 km away sitting next to their
The Earth has a surface temperature around 270 K and an emissivity of 0.8, while space has a temperature of around 2 K. If the Earth is in thermal equilibrium, how much power must the Earth absorb from the Sun
An undersea research chamber for aquanauts is spherical with an external diameter of 7.93 m. The mass of the chamber, when occupied, is 64800 kg. What is the buoyant force on the chamber
Suppose a muon produced as a result of a cosmic ray colliding with a nucleus in the upper atmosphere has a velocity v = 0.9500c. How far would it have traveled as observed on earth
An RLC circuit has a sinusoidal voltage supplied to it at 632 kHz with a peak voltage of 748 V; a 25 k? resistance; a 16 µF capacitance; what is the peak current for this circuit
A student pushes a loaded sled whose mass m is 240kg for a distance d of 2.3m over the frictionless surface of a forzen lake. if the sled starts from rest, what is its final velocity
A car travelling at 105 strikes a tree. The front end of the car compresses and the driver comes to rest after travelling 0.85. What was the magnitude of an average acceleration of the driver during the collision? State the answer in terms of "'s,..
A constant force of 23 N pulls on a 12 kg block on a horizontal surface. What is the work done by the constant force
A rod is 2.40 m long and has a diameter of 2.50 mm. What is the Young's modulus for this rod
The crankshaft in a race car goes from rest to 3060rpm in 2.1s. What is the crankshaft's angular acceleration
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